[1] Washington Univ, Sch Med, Dept Neurol, St Louis, MO 63110 USA
[2] Washington Univ, Sch Med, Dept Mol Biol & Pharmacol, St Louis, MO 63110 USA
[3] Washington Univ, Sch Med, Ctr Study Nervous Syst Injury, St Louis, MO 63110 USA
[4] Lilly Res Labs, Neurosci Discovery Res, Indianapolis, IN 46285 USA